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The temperature at which electrical resistance is zero is called the critical temperature (Tc) and varies with the individual material. For practical purposes, critical temperatures are achieved by cooling materials with either liquid helium or liquid nitrogen. The following table shows the critical temperatures of various superconductors:
Material Type Tc(K)
Zinc metal 0.88
Aluminum metal 1.19
Tin metal 3.72a
Mercury metal 4.15
YBa2Cu3O7 ceramic 90
TlBaCaCuO ceramic 125
Because these materials have no electrical resistance, meaning electrons can travel through them freely, they can carry large amounts of electrical current for long periods of time without losing energy as heat...
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